23123111989 has 2 divisors, whose sum is σ = 23123111990. Its totient is φ = 23123111988.

The previous prime is 23123111971. The next prime is 23123112053. The reversal of 23123111989 is 98911132132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18918627025 + 4204484964 = 137545^2 + 64842^2 .

It is a cyclic number.

It is not a de Polignac number, because 23123111989 - 2⁹ = 23123111477 is a prime.

It is a super-2 number, since 2×23123111989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23123111959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11561555994 + 11561555995.

It is an arithmetic number, because the mean of its divisors is an integer number (11561555995).

Almost surely, 2^23123111989 is an apocalyptic number.

It is an amenable number.

23123111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23123111989 is an equidigital number, since it uses as much as digits as its factorization.

23123111989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 40.

The spelling of 23123111989 in words is "twenty-three billion, one hundred twenty-three million, one hundred eleven thousand, nine hundred eighty-nine".